If using gasless: Verify your polarity is set to DCEN (Torch Negative).
The front panel of the CEM Dual Mig 120 keeps controls simple and intuitive. Turns the machine on and off.
Start with these settings, then listen for the "sizzling bacon" sound to fine-tune.
The CEM Dual MIG 120 is a classic, compact gas/gasless wire-feed welder highly valued by DIY enthusiasts, automotive restorers, and light-duty fabricators. Manufactured by the Italian company CEM (Costruzioni Elettromeccaniche Ancona), this machine is known for its robust transformer-based build and reliability. cem dual mig 120 manual
Unscrew the gas nozzle and the copper contact tip from the welding gun end. This prevents the wire from catching inside the gun during the initial feed.
Properly feeding the wire prevents birds-nesting (tangled wire) and erratic feeding during operation. Turn off and unplug the welder.
The may be difficult to find, but the machine is still capable of reliable performance with proper care. By following these maintenance and troubleshooting guidelines, you can keep this classic welder in good working order for many years. If using gasless: Verify your polarity is set
When welding with , use the push technique (forehand welding) to ensure optimal gas coverage over the weld puddle.
Before firing up your machine, it is vital to understand its electrical and mechanical limits to prevent overheating or component damage. 230V AC (50/60 Hz), Single Phase Amperage Range: 30A to 120A Max Duty Cycle: Typically 10% at 100A, 60% at 45A, 100% at 35A
Close the pressure arm and set the tension knob (do not overtighten). 🎛️ Control Panel and Operation Start with these settings, then listen for the
Finding official CEM parts is exceptionally difficult. However, many owners have successfully used generic parts as replacements.
Maintain a distance of 1/4" to 1/2" between the contact tip and the metal workpiece. An excessive stick-out weakens electrical current and destabilizes the arc. 7. Maintenance and Care
The CEM Dual Mig 120 features interchangeable polarity, allowing you to switch between standard MIG (GMAW) and Flux-Cored (FCAW) welding. Standard MIG Welding (Gas Shielded)
Set voltage to position “3.” Step 2: Set wire speed to “4.” Step 3: Pull the trigger on a scrap piece.
Setting 4 (Max + 2): Maximum heat for thick plate welding up to 4mm-5mm.